In a shocking interview, Stephanie Santoro, the Gosselin babysitter who was romantically involved with Jon, exclusively told RadarOnline.com the explosive news that Jon has been hacking into Kate’s email, phone and on-line banking accounts! After many denials to the contrary, on Tuesday Jon was ordered by a Pennsylvania judge to return $180,000 that he stole from an account he shared with Kate. Wait until Kate and the judge learn that he’s been stealing her information too!

“Jon told me that he pretty much hacked into everything of Kate’s that he had access to,” Jon’s former short term girlfriend Stephanie told RadarOnline.com: “Her online banking, that he had a trace on every single one of her emails so anytime she would get an email he would get a copy of it!”

Despite his recent media blitz where he said he was trying to work things out with the mother of his eight children, Stephanie said that Jon has been plotting for a while to financially harm Kate. “He told me that he had enough there that when the ball dropped he would have enough to completely screw her over,” Santoro said about Jon Gosselin.

Jon hasn’t been playing fair with Kate since he started dating other women, taking his girlfriend on yachts in France and dining in fancy Beverly Hills restaurants. “When it comes down to it, he will use every single thing against her,” Stephanie told RadarOnline.com

Jon doesn’t seem afraid of people knowing that he is illegally hacking into Kate’s accounts. Stephanie told us “Jon threatens everyone that he will sue them if they tell what they know.” Santoro said Jon’s lawyers have left her family voice mail messages, but that she has not been sued by Jon yet.